“The recent trends in winter precipitation have been accompanied by respective trends in sunshine (significant increase in all subregions of 17 to 29%)”
INTERNATIONAL JOURNAL OF CLIMATOLOGY
Int. J. Climatol. 27: 17–46 (2007)
Published online 6 July 2006 in Wiley InterScience
(www.interscience.wiley.com) DOI: 10.1002/joc.1377
http://coast.gkss.de/G/Mitarbeiter/storch/pdf/Auer.histalp.2007.pdf
sunshine hours 